IOS wants to display the 3D model of STL class through openGL. What should I do

  ios, question

After displaying the. stl model file on the ios side and analyzing the various types of coordinates of the stl file, I don’t know how to operate it. I want to find a demo or a great god to give me a thought. . Thank

Stl file content format
Acet normal -1.000000e plus 000 -0.000000e plus 000 -0.000000e plus 000

outer loop

Vertex 0.000000e+000 1.500000e+002 1.000000e+002
 
 Vertex 0.000000e+000 1.500000e+002 0.000000e+000
 
 Vertex 0.000000e+000 0.000000e+000 1.000000e+002

endloop

endfacet

Has the landlord solved this problem? I have also encountered this problem now. Is it convenient for me to give some advice?